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compAct powerfUl anD reliAble piezoeleCtrIc acTuator for landing gear sYstems

Periodic Reporting for period 1 - AUDACITY (compAct powerfUl anD reliAble piezoeleCtrIc acTuator for landing gear sYstems)

Reporting period: 2019-04-01 to 2020-03-31

The objective of the AUDACITY project is to make the demonstration of a compact powerful and reliable piezoelectric actuator for future locking applications in landing gear systems.

AUDACITY aims at impacting the competitiveness of Europe and Associated countries with the direct creation of 20 jobs and 45 Millions of cumulative sales before 2030.
The main objective is to develop and test a piezoelectric actuator, which
• has a power to mass ratio 10 times higher than the SoA
• has to be reliable under the heavy environmental conditions, and the applied load.
That way, several technical challenges will be solved, allowing the technology to be demonstrated as reliable for such kind of application.
1.2.1 Work Package 1
The work performed for the first work package described by entity is detailed here after.
CTEC:
The tasks performed by CTEC are the following:
• Trade-off of concepts,
7 concepts evaluated through trade off. Initially 5 were forecast. Evaluation of Inchworm actuators in the trade-off, completed with one backup resonant actuator, and one FSPA from CTEC.
2 main concepts (inchworm) kept and pushed to preliminary design step plus one backup concept based on resonant piezo motor.

• Analytical calculation of the two(2) chosen concepts plus the Backup one. The calculation performed validated the good theorical behaviour of the concepts regarding the force, speed and thermal stability performances.
• Preliminary design with FEM of the two(2) chosen concepts. These analyses validated the mechanical consistency of the 3D models. Each step of actuation has been checked and validated regarding the stresses and deformations of the concepts.

• Preliminary study on the Electronic design action plan

CSEM:
• Thermal model correlation with CTEC experimental thermal test results.
• Materials data (Metals + piezo) identifications for electro-thermo-mechanical simulations.
• Preliminary thermo-mechanical simulations completed to assess the influence of heat transfer on structural mechanics.
• Thermoelastic analysis of the two chosen concepts. Calculation of the load transfer between clamps, for the whole temperature range. Amelioration propositions of the concepts, making them operational on the required temperature range.



UNIROMA:
• Extensive literature review of frictional tests on material pairs leading to a preliminary list of material pairs suitable for the application in terms of friction coefficient.
• Selection of commercial solutions and suppliers for the focused materials.
• Adaptation of the tribometer, present at UNIRM1, to the preliminary frictional test campaign. Acquisition of the needed instrumentation and its implementation.
• Preliminary frictional test campaign, on the selected material pairs, for obtaining static and dynamic friction coefficients in standard conditions, within the loading range forecasted for the application.
• Planning and design of the new tribometer, to test the selected material pairs under representative conditions of the real ones with the piezoelectric actuators.


1.2.2 Work Package 2
- Study of TWO backup solutions, including analytical and FEM calculation. One prototype has been machined and will be tested for the end of WP2.
- Detailed analysis of the two chosen concepts in their driving methods.
- More precise FEM calculations for each mechanism functioning steps.



1.2.2 Work package 5
The PEDR has been issued and submitted during the first reporting period. This document is in line with the plan for exploitation and dissemination of results as described in the DoA.
Outstanding W5 action:
Project management:
• KO meeting @ SAFRAN
• Intermediates meeting and visio conferences
• Project reporting

Disseminations and communications:
Web and blog pages created on CEDRAT website
• CTEC has updated piezo motor training course thanks to the concepts
• Abstract submitted at ACTUATOR CONFERENCE 2020 DE (but postponed by COVID in feb 2021)
• Project leaflet designed
• Social media
National Aerospace clusters publication: http://www.aerospace-cluster.fr/news-entreprises/lindustrie-aeronautique-innove-en-auvergne-rhone-alpes/
Audacity is required to get rid of the well-established hydraulic actuators in order to comply with System ITD Strategic Objectives in terms of environmental impact and More Electric Aircraft (MAE). The technical objective is then to integrate all the technical progresses within a prototype for TRL4 demonstration.